In German, and other languages, it is common to have a word between your first and last name.
For example, a typical Dutch name would be:
"Jan de Vries". Where "Vries" is the last name and "Jan" the first name.
"Charles de Gaulle" is a French example.
What would I call "de" in this case?
Best Answer
@Graffito pointed a possible the answer when he mentioned the nobiliary particle:
However, the mentioned de, as well as the common Dutch van are not signs of nobility (contrary to the German Von). However, the wikipedia article continues:
So it seems that at least grammatically we can refer to it as a prepositional particle, used in the same way as a nobiliary particle.
Of course, I doubt anyone would know what to fill in on a form if you use prepositional particle as a descriptor of a name field...
As far as usage is concerned, the prepositional particle is considered part of the surname. So Jan de Vries has the surname de Vries, not Vries. In Belgium, the prepositional particle is even used when ordering names alphabetically.